Measles and Rubella
If the case received a vaccine containing the virus (measles or rubella) in the 6 weeks prior to symptom onset: Evidence of infection with a wild-type virus strain obtained through genetic characterisation.

If the case did not receive a vaccine containing the virus (measles or rubella) in the 6 weeks prior to symptom onset:
Detection of IgM antibody specific to the virus
OR
IgG seroconversion or a significant rise (four-fold or greater) in antibody level for the virus between paired sera tested in parallel where the convalescent serum was collected 10 to 14 days after the acute serum
OR
Isolation of the virus by culture
OR
Detection of the virus by nucleic acid test (NAT)

Mumps
Detection of the virus by nucleic acid test (PCR)
OR
Isolation of the virus by culture
AND
If the case received a vaccine containing the mumps virus in the 6 weeks prior to symptom onset:

Evidence of infection with a wild-type virus strain obtained through genetic characterisation.